Issue 41, 2019

Detecting electronic structure evolution of semiconductor nanocrystals by magnetic circular dichroism spectroscopy

Abstract

The evolution of electronic states of nanocrystals under shape variation is hardly detected by conventional optical and electronic instruments due to the condensed electronic levels of nanocrystals. Herein, we demonstrate that magnetic circular dichroism (MCD) spectroscopy is a high-resolution method to monitor this delicate progress on account of the sensitive Zeeman response to electronic states. In particular, the MCD intensity of the first excitonic transition exponentially decreases with the shape changing from quantum dots to quantum rods owing to the increased density of valence pz state with elongation in the z direction, which contributes much less to MCD intensity compared with p±. This work provides a simple but effective strategy for understanding the electronic state evolution in various semiconductor nanomaterials.

Graphical abstract: Detecting electronic structure evolution of semiconductor nanocrystals by magnetic circular dichroism spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
28 Apr. 2019
Accepted
28 Mei 2019
First published
04 Jun. 2019

Nanoscale, 2019,11, 19380-19386

Detecting electronic structure evolution of semiconductor nanocrystals by magnetic circular dichroism spectroscopy

X. Gao, X. Zhang, X. Yang, L. Zhao, B. Han, H. R. Alanagh and Z. Tang, Nanoscale, 2019, 11, 19380 DOI: 10.1039/C9NR03630J

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